crest

ampullar crest (ampullary crest) the most prominent part of a localized thickening of the membrane that lines the ampullae of the semicircular ducts, covered with neuroepithelium containing endings of the vestibular nerve.

dental crest the maxillary ridge passing along the alveolar processes of the fetal maxillary bones.

crest

(krest) a projection, or projecting structure or ridge, especially one surmounting a bone or its border.

ampullar crest the most prominent part of a localized thickening of the membrane lining the ampullae of the semicircular ducts.

frontal crest a median ridge on the internal surface of the frontal bone.

iliac crest the thickened, expanded upper border of the ilium.

intertrochanteric crest a ridge on the posterior femur connecting the greater with the lesser trochanter.

lacrimal crest, anterior the lateral margin of the groove on the posterior border of the frontal process of the maxilla.

lacrimal crest, posterior a vertical ridge dividing the lateral or orbital surface of the lacrimal bone into two parts.

nasal crest

1. (of maxilla) a ridge, raised along the medial border of the palatine process of the maxilla, with which the vomer articulates.

2. (of palatine) a thick ridge projecting superiorly from the horizontal plate of the palatine bone and articulating with the posterior part of the vomer.

neural crest a cellular band dorsolateral to the embryonic neural tube that gives origin to the spinal ganglia and other structures.

occipital crest, external a ridge sometimes extending on the external surface of the occipital bone from the external protuberance toward the foramen magnum.

occipital crest, internal a median ridge on the internal surface of the occipital bone, extending from the midpoint of the cruciform eminence toward the foramen magnum.

palatine crest a transverse ridge sometimes seen on the inferior surface of the horizontal plate of the palatine bone.

pubic crest the thick, rough anterior border of the body of the pubic bone.

sacral crest any of various ridges or tubercles on the dorsal surface of the sacrum, named for their location as median or as lateral or medial (relative to the dorsal sacral foramina); used alone it usually denotes the median sacral crest.

Neural crest cells appear early in human and other animal prenatal development, and they give rise to many important structures, including most of the nervous system (apart from the brain and spinal cord), the bones of the skull and jaws, and pigment-producing skin cells.

By the 1860s, sets of crests were being produced for collectors along with special albums to house them in, the four major producers of albums being Marcus Ward, Stafford Smith, William Lincoln and Stanley Gibbons of postage stamp fame.

Vendors often achieve the highest prices by selling the crests one by one on auction sites like eBay.

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